CN117907109A - An adaptive hoop mechanical loading system - Google Patents

Abstract

The present invention relates to an adaptive annular mechanical loading system, comprising a first reaction frame and a second reaction frame, the first reaction frame and the second reaction frame are both annular and have a plurality of loading components therebetween, and is characterized in that the loading component comprises a loading hydraulic cylinder, the cylinder body of the loading hydraulic cylinder is connected to a rotating shaft, the piston rod of the loading hydraulic cylinder is universally connected to a distribution beam, the rotating shaft is rotatably connected to the first reaction frame and the second reaction frame, one end of the rotating shaft extends to the outside of the first reaction frame and is connected to an angle adjustment mechanism installed on the outer side of the first reaction frame, the outer side of the second reaction frame is provided with a clamping mechanism to clamp and fix the other end of the rotating shaft, and the annular mechanical loading system of the present invention has strong applicability.

Description

An adaptive hoop mechanical loading system

Technical Field

The invention relates to the technical field of civil engineering test equipment, and in particular to an adaptive annular mechanical loading system.

Background technique

The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

With the increasing number, length, width, speed and vehicle density of tunnels, the risk of accidents in tunnels is becoming more and more prominent. It is crucial to evaluate the bearing capacity of tunnel structures and reveal the real corresponding laws of tunnel structures under disaster environments for tunnel design and engineering safety. Through model tests, a reaction loading system is designed to simulate the stress of tunnel structures, which is widely used in the study of surrounding rock stability analysis, disaster response laws, etc.

Patent CN113008685B discloses a multi-point loading self-balancing reaction force system with adjustable loading position. Its implementation method can solve the problem that the reaction force loading system in the prior art cannot adjust the loading position and the system cannot be self-balanced, and realizes adaptive circumferential mechanical loading. However, the inventor found that in the technical solution of the above patent, the distance of the distribution beam is adjusted by an electric push rod, and then the hydraulic cylinder is used for loading. The locking assembly drives the rigid wedge block to be embedded in the groove of the fixed rod through the second telescopic rod to lock after the distance adjustment. In this way, when a large load is received, the rigid wedge block will produce micro-deformation and bite and lock, which affects the subsequent test. In addition, the angle adjustment mechanism is arranged between the two reaction force frames, and the electric telescopic rod is used for angle adjustment. On the one hand, the electric telescopic rod is arranged between the two reaction force frames, and the size and specification of the electric telescopic rod that can be applied are limited, and its bearing capacity is also limited, which cannot meet the needs of large load tests. On the other hand, the locking of the electric telescopic rod itself is relied on to lock the rotating block after rotating a certain angle, which also cannot meet the needs of large load tests. In summary, the solution of the above patent is poor in applicability.

Summary of the invention

In view of the deficiencies in the prior art, the purpose of the present invention is to provide an adaptive circumferential mechanical loading system, which overcomes the defects of the existing adaptive reaction force loading system and has strong applicability.

In order to achieve the above object, the present invention is implemented through the following technical solutions:

An embodiment of the present invention provides an adaptive annular mechanical loading system, including a first reaction frame and a second reaction frame, both of which are annular and have multiple loading components arranged therebetween, the loading components including a loading hydraulic cylinder, a cylinder body of the loading hydraulic cylinder being connected to a rotating shaft, a piston rod of the loading hydraulic cylinder being universally connected to a distribution beam, a rotating shaft being rotatably connected to the first reaction frame and the second reaction frame, one end of the rotating shaft extending to the outside of the first reaction frame and being connected to an angle adjustment mechanism installed on the outer side of the first reaction frame, and a clamping mechanism being provided on the outer side of the second reaction frame to clamp and fix the other end of the rotating shaft.

Optionally, the angle adjustment mechanism includes a connecting rod, a rotating shaft is fixed to one end of the connecting rod, the other end of the connecting rod is hinged to the piston rod of the angle adjustment hydraulic cylinder, the cylinder body of the angle adjustment hydraulic cylinder is hinged to the fixed seat, and the fixed seat is fixed to the outer side of the first reaction frame.

Optionally, an inclination sensor is installed on the connecting rod to detect its rotation angle.

Optionally, the clamping mechanism includes a first support and a second support arranged relatively to each other, the first support and the second support are fixed to the outer side of the second reaction frame, the first support is fixed with a first clamping hydraulic cylinder, the second support is fixed with a second clamping hydraulic cylinder, the piston rod of the first clamping hydraulic cylinder is fixed with a first clamping block, and the piston rod of the second clamping hydraulic cylinder is fixed with a second clamping block.

Optionally, the side surfaces of the first clamping block and the second clamping block that are used to contact the end of the rotating shaft are arc-shaped surfaces that match the rotating shaft.

Optionally, the piston rod of the loading hydraulic cylinder is connected to the distribution beam via a ball joint support to achieve a universal connection with the distribution beam.

Optionally, a magnetostrictive sensor is provided between the distribution beam and the end of the cylinder body of the loading hydraulic cylinder to detect the extension distance of the piston rod of the loading hydraulic cylinder.

Optionally, the rotating shaft includes a first shaft section, a second shaft section and a sleeve arranged between the first shaft section and the second shaft section, the sleeve is sleeved on the periphery of the cylinder body of the loading hydraulic cylinder and is fixedly connected to the cylinder body of the loading hydraulic cylinder, the first shaft section is rotatably connected to the first reaction frame, and the second shaft section is rotatably connected to the second reaction frame.

Optionally, the first reaction frame is fixed with a first load-bearing beam, the first shaft section coaxially passes through the first load-bearing beam, and both ends of the first load-bearing beam are rotatably connected to the first shaft section through a bearing assembly; the second reaction frame is fixed with a second load-bearing beam, the second shaft section coaxially passes through the second load-bearing beam, and both ends of the second load-bearing beam are rotatably connected to the second shaft section through a bearing assembly.

Optionally, end covers are provided at both ends of the first load-bearing beam and are fixedly connected to the first reaction frame through the end covers, and end covers are provided at both ends of the second load-bearing beam and are fixedly connected to the second reaction frame through the end covers.

The beneficial effects of the present invention are as follows:

1. In the loading system of the present invention, the angle adjustment mechanism is arranged on the outside of the first reaction frame, and the outside of the second reaction frame is provided with a clamping mechanism, which can clamp the rotating shaft. The selection and installation of the angle adjustment mechanism are not affected by the first reaction frame and the second reaction frame. An angle adjustment mechanism with a larger bearing capacity can be selected. At the same time, combined with the clamping mechanism, the loading reaction force is jointly borne by the locking force of the clamping mechanism and the angle adjustment mechanism itself, thereby meeting the demand for larger loading loads and improving the applicability of the entire loading system.

2. The loading system of the present invention uses a loading hydraulic cylinder that is directly universally connected to the distribution beam to achieve loading. Compared with the existing method of using an electric push rod to adjust the distance and then using a hydraulic cylinder for loading, it eliminates locking components such as rigid wedges and fixed rods, avoids the bite locking phenomenon under large load conditions, and ensures the normal operation of the loading system.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

FIG1 is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

FIG2 is a schematic diagram of the structure of a partially cutaway embodiment of the present invention;

3 is a schematic diagram of the cooperation between the loading assembly, the angle adjustment mechanism and the clamping mechanism in Embodiment 1 of the present invention;

FIG4 is a partial enlarged schematic diagram of the interior of the loading hydraulic cylinder in Embodiment 1 of the present invention;

5 is a schematic cross-sectional view of FIG. 3 of the present invention along a direction parallel to the first reaction frame and the second reaction frame;

6 is a schematic cross-sectional view of FIG. 3 of the present invention along a direction perpendicular to the first reaction frame and the second reaction frame;

7 is a schematic diagram of the magnetostrictive sensor arrangement according to Embodiment 1 of the present invention;

FIG8 is a schematic diagram of the structure of the angle adjustment mechanism of Embodiment 1 of the present invention;

9 is a schematic structural diagram of a clamping mechanism according to Embodiment 1 of the present invention;

Among them, 1. first reaction frame, 2. loading assembly, 3. second reaction frame, 4. angle adjustment mechanism, 5. clamping mechanism, 6. rotating shaft, 7. second bearing beam, 8. first bearing beam, 9. cover plate, 10. self-aligning bearing, 11. thrust bearing;

2-1. Loading hydraulic cylinder, 2-2. Piston, 2-3. Piston rod, 2-4. Distribution beam, 2-5. Ball joint support, 2-6. Magnetostrictive sensor;

4-1. Angle adjustment hydraulic cylinder, 4-2. Cylinder seat, 4-3. Articulated shaft, 4-4. Fixed seat, 4-5. Articulated seat, 4-6. Connecting rod, 4-7. Fixed cylinder, 4-8. Inclination sensor;

5-1. The first support, 5-2. The second support, 5-3. The first clamping hydraulic cylinder, 5-4. The first clamping block, 5-5. The second clamping hydraulic cylinder, 5-6. The second clamping block;

6-1. First shaft section, 6-2. Second shaft section, 6-3. Sleeve.

Detailed ways

Example 1

The present embodiment provides an adaptive annular mechanical loading system, as shown in FIG. 1-FIG. 2, comprising a first reaction frame 1 and a second reaction frame 3, wherein the first reaction frame 1 and the second reaction frame 3 are arranged in parallel, and the first reaction frame 1 and the second reaction frame 3 are both annular structures, and the bottom ends of the first reaction frame 1 and the second reaction frame 3 are fixed on a base.

The first reaction frame 1 and the second reaction frame 3 adopt a hollow structure and are welded by multiple sections of 2 cm thick steel components, which reduces the material consumption of the two reaction frames and reduces the processing and manufacturing cost of the equipment. The remaining structures of the first reaction frame 1 and the second reaction frame 3 and the structure of the base can adopt the technical solution disclosed in patent CN113008685B, which will not be described in detail here.

The arrangement of the reaction frame in this embodiment can achieve self-balancing of the system when the model is loaded.

The space between the first reaction frame 1 and the second reaction frame 3 is provided with multiple groups of loading components 2, preferably, nine groups of loading components 2 are provided, which can meet the load-bearing requirements of tunnel models with different cross sections in any direction. The first reaction frame 1 and the second reaction frame 3 are provided with nine loading holes for installing the loading components.

Compared with the technical solution disclosed in patent CN113008685B, this embodiment improves the structure of the loading component.

As shown in Figures 3 to 7, the loading assembly 2 includes a loading hydraulic cylinder 2-1, which is arranged between the first reaction frame 1 and the second reaction frame 3. The piston rod stroke of the loading hydraulic cylinder 2-1 is not less than 2 meters, meeting the loading requirements.

The loading hydraulic cylinder 2-1 has a piston 2-2 therein, and the piston 2-2 is connected to a piston rod 2-3.

The piston rod end of the loading hydraulic cylinder 2-1 is universally connected to a distribution beam 2-4, and the distribution beam 2-4 is used to contact the tunnel model and apply load to the tunnel model.

Preferably, the end of the piston rod 2-3 of the loading hydraulic cylinder 2-1 is connected to the distribution beam 2-4 through a ball joint support 2-5 to achieve a universal connection with the distribution beam.

Compared with the method described in patent CN113008685B in which two hydraulic cylinders are connected to the distribution beam, the universal connection between the distribution beam and the loading hydraulic cylinder can meet the requirements of test pieces with different shapes.

In this embodiment, the loading hydraulic cylinder 2-1 is used to directly load the tunnel model, without the need to first use an electric push rod to adjust the position of the hydraulic cylinder and then use the hydraulic cylinder for loading. This eliminates the need to set up a locking component, making the equipment simpler and eliminating locking components such as rigid wedges and fixed rods, thereby avoiding the bite locking phenomenon under larger load conditions and ensuring the normal operation of the loading system.

A magnetostrictive sensor 2-6 is provided between the cylinder end of the loading hydraulic cylinder 2-1 and the distribution beam 2-4 to detect the extension distance of the piston rod 2-3 of the loading hydraulic cylinder 2-1, thereby controlling the loading load size. The loading load size can also be controlled by an oil pressure sensor installed on the oil supply line of the loading hydraulic cylinder 2-1.

The cylinder body of the loading hydraulic cylinder 2-1 is connected to the rotating shaft 6, and the rotating shaft 6 passes through the first reaction frame 1 and the second reaction frame 3 and is rotatably connected to the first reaction frame 1 and the second reaction frame 3 to achieve the adjustment of the angle of the loading hydraulic cylinder 2-1.

An angle adjustment mechanism 4 is provided on the outer side of the first reaction frame 1, and the angle adjustment mechanism 4 is connected to the end of the rotating shaft 6 extending to the outer side of the first reaction frame 1 to drive the rotating shaft 6 to rotate around its own axis, thereby realizing the angle adjustment of the loading hydraulic cylinder 2-1.

The outer side surface of the second reaction frame 3 is provided with a clamping mechanism 5 , which is used to clamp the end of the rotating shaft 6 extending to the outer side of the second reaction frame 3 , thereby locking and fixing the rotating shaft 6 .

As shown in Figure 8, the angle adjustment mechanism 4 includes an angle adjustment hydraulic cylinder 4-1, the cylinder body of the angle adjustment hydraulic cylinder 4-1 is fixed on the cylinder seat 4-2, the cylinder seat 4-2 is rotatably connected to the fixed seat 4-4 through the hinge shaft 4-3, and the fixed seat 4-4 is fixed to the outer side of the first reaction frame by multiple bolts.

An articulated seat 4-5 is provided at the end of the piston rod of the angle adjustment hydraulic cylinder 4-1, and is hinged to one end of a connecting rod 4-6 through the articulated seat 4-5 and an articulated shaft. A fixed cylinder 4-7 is provided at the other end of the connecting rod 4-6. The fixed cylinder 4-7 is sleeved on the outer periphery of the rotating shaft extending to the end of the first reaction frame and is fixedly connected to the rotating shaft.

The telescopic movement of the piston rod of the angle adjustment hydraulic cylinder 4-1 can drive the rotating shaft 6 to rotate around its own axis through the connecting rod 4-6.

As shown in Figure 9, the clamping mechanism 5 is fixed to the outer side surface of the second reaction frame 3. The clamping mechanism 5 includes a first support 5-1 and a second support 5-2. The first support 5-1 and the second support 5-2 are arranged opposite to each other and are arranged on both sides of the outer end of the rotating shaft 6 extending out of the second reaction frame 3, that is, the first support 5-1 and the second support 5-2 are arranged 180° apart.

The first support 5 - 1 is fixed to the outer side surface of the second reaction frame 3 by a plurality of bolts, and the second support 5 - 2 is fixed to the outer side surface of the second reaction frame 3 by a plurality of bolts.

The first support 5-1 is fixedly connected to the cylinder end of the first clamping hydraulic cylinder 5-3, and the piston rod end of the first clamping hydraulic cylinder 5-3 is connected to the first clamping block 5-4. The second support 5-2 is fixedly connected to the cylinder end of the second clamping hydraulic cylinder 5-5, and the piston rod end of the second clamping hydraulic cylinder 5-5 is connected to the second clamping block 5-6. The first clamping hydraulic cylinder 5-3 and the second clamping hydraulic cylinder 5-5 are coaxially arranged opposite to each other. The first clamping block 5-4 and the second clamping block 5-6 are used to clamp the end of the rotating shaft extending to the outside of the second reaction frame 3. The first clamping hydraulic cylinder 5-3 and the second clamping hydraulic cylinder 5-5 can drive the first clamping block 5-4 and the second clamping block 5-6 to move toward or away from each other, thereby realizing the switching of the clamping and loosening states of the rotating shaft.

The side surfaces opposite to the first clamping block 5-4 and the second clamping block 5-6, that is, the side surfaces for contacting the rotating shaft 6, are arc-shaped surfaces matching the rotating shaft 6 and are roughened to increase the friction between the rotating shaft 6 and the rotating shaft 6, so as to better lock and fix the rotating shaft 6.

The connecting rod 4-6 is provided with an inclination sensor 4-8 to detect its rotation angle. The inclination sensor may be an existing single-axis inclination sensor. When the inclination sensor detects that the rotating shaft 6 has rotated to a set angle, the first clamping hydraulic cylinder 5-3 and the second clamping hydraulic cylinder 5-5 start working, and the first clamping block 5-4 and the second clamping block 5-6 are used to clamp the rotating shaft to achieve locking of the rotating shaft.

In this embodiment, the rotating shaft 6 includes a first shaft section 6-1 and a second shaft section 6-2 which are coaxially arranged, and a sleeve 6-3 is provided between the first shaft section 6-1 and the second shaft section 6-2. The sleeve 6-3 is sleeved on the outer periphery of the cylinder body of the loading hydraulic cylinder 2-1 and is fixedly connected to the cylinder body of the loading hydraulic cylinder 2-1 through a flange 2-7 and a plurality of bolts provided at the end of the cylinder body 2-1 of the loading hydraulic cylinder.

The first shaft section 6-1 passes through the first reaction frame 1, and a first load-bearing beam 8 is arranged inside the first reaction frame 1. The first load-bearing beam 8 is coaxially sleeved on the outer periphery of the first shaft section 6-1, and cover plates 9 are arranged at both ends of the first load-bearing beam 8. The cover plates 9 at both ends are respectively fixed to the inner side surface and the outer side surface of the first reaction frame 1 by bolts to fix the first load-bearing beam 8. Stiffening plates are arranged between the two ends of the first load-bearing beam 8 and the inner surface of the first reaction frame 1 to enhance the structural strength of the entire first reaction frame 1.

The two ends of the first load-bearing beam 8 are rotatably connected to the first shaft section 6 - 1 via a bearing assembly. The bearing assembly includes a self-aligning bearing 10 and a thrust bearing 11 , wherein the self-aligning bearing 10 is located on the inner side of the thrust bearing 11 .

The bearing assembly at the outer end of the first load-bearing beam 8 is axially positioned by a fixing tube 4-7 sleeved on the outer periphery of the end of the rotating shaft 6, and the bearing assembly at the inner end of the first load-bearing beam 8 is axially positioned by a shoulder structure provided in the first shaft section 6-1.

The second shaft section 6-2 passes through the second reaction frame 3, and a second load-bearing beam 7 is arranged inside the second reaction frame 3. The second load-bearing beam 7 is coaxially sleeved on the outer periphery of the second shaft section 6-2, and cover plates 9 are arranged at both ends of the second load-bearing beam 7. The cover plates 9 at both ends are respectively fixed to the inner side surface and the outer side surface of the second reaction frame 3 by bolts to fix the second load-bearing beam 7. Stiffening plates are arranged between the two ends of the second load-bearing beam 7 and the inner surface of the second reaction frame 3 to enhance the structural strength of the entire second reaction frame 3.

The two ends of the second load-bearing beam 7 are rotatably connected to the second load-bearing beam 7 via a bearing assembly. The bearing assembly includes a self-aligning bearing 10 and a thrust bearing 11 , wherein the self-aligning bearing 10 is located on the inner side of the thrust bearing 11 .

The bearing assembly at the outer end of the second load-bearing beam 7 is axially positioned by a retaining ring sleeved on the end of the rotating shaft 6, and the bearing assembly at the inner end of the second load-bearing beam 7 is axially positioned by a shoulder structure provided on the second shaft section 6-2.

Since the rotating shaft 6 can rotate, the angle of the loading hydraulic cylinder 2-1 can be adjusted, and the distribution beam 2-4 is universally connected to the piston rod 2-3 of the loading hydraulic cylinder 2-1, which is applicable to tunnel models with different cross-sectional sizes and shapes.

The working method of the annular mechanical loading system of this embodiment is:

The angle adjustment mechanism drives the rotating shaft 6 to rotate through the angle adjustment hydraulic cylinder 4-1 according to the angle requirement of the loading point of the test model, and adjusts the angle of the loading hydraulic cylinder 2-1 and the distribution beam 2-4 to achieve adjustment to meet the requirements of various cross-sectional forms such as circular, rectangular, elliptical, polygonal, horseshoe, and double circular combination. After the angle sensor detects that the angle reaches the requirement, the first clamping hydraulic cylinder 5-3 and the second clamping hydraulic cylinder 5-5 work to clamp the rotating shaft 6.

After the angle adjustment is completed, the loading hydraulic cylinder 2-1 works, and its piston rod 2-3 applies load to the tunnel model through the distribution beam 2-4. The size of the load is controlled according to the magnetostrictive displacement sensor 2-6 or the oil pressure sensor.

In the loading system of this embodiment, the angle-adjusting hydraulic cylinder 4-1 is arranged on the outside of the first reaction frame 1, and a clamping mechanism 5 is provided on the outside of the second reaction frame 3. The clamping mechanism 5 can clamp the rotating shaft 6. The selection and installation of the angle-adjusting hydraulic cylinder 4-1 are not affected by the space between the first reaction frame 1 and the second reaction frame 3. The angle-adjusting hydraulic cylinder 4-1 with a larger bearing capacity can be selected. At the same time, combined with the clamping mechanism 5, the loading reaction force is jointly borne by the locking force of the clamping mechanism 5 and the angle-adjusting hydraulic cylinder 4-1 itself, thereby meeting the demand for larger loading loads and improving the applicability of the entire loading system.

The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. An adaptive annular mechanical loading system, comprising a first reaction frame and a second reaction frame, the first reaction frame and the second reaction frame are both annular and have a plurality of loading assemblies therebetween, characterized in that the loading assembly comprises a loading hydraulic cylinder, the cylinder body of the loading hydraulic cylinder is connected to a rotating shaft, the piston rod of the loading hydraulic cylinder is universally connected to a distribution beam, the rotating shaft is rotatably connected to the first reaction frame and the second reaction frame, one end of the rotating shaft extends to the outside of the first reaction frame and is connected to an angle adjustment mechanism installed on the outer side of the first reaction frame, and a clamping mechanism is provided on the outer side of the second reaction frame to clamp and fix the other end of the rotating shaft. 2. An adaptive annular mechanical loading system as described in claim 1, characterized in that the angle adjustment mechanism includes a connecting rod, a rotating shaft is fixed to one end of the connecting rod, the other end of the connecting rod is hinged to the piston rod of the angle adjustment hydraulic cylinder, the cylinder body of the angle adjustment hydraulic cylinder is hinged to the fixed seat, and the fixed seat is fixed to the outer side of the first reaction frame. 3. An adaptive circumferential mechanical loading system as described in claim 2, characterized in that an angle sensor is installed on the connecting rod to detect its rotation angle. 4. An adaptive annular mechanical loading system as described in claim 1, characterized in that the clamping mechanism includes a first support and a second support arranged opposite to each other, the first support and the second support are fixed to the outer side of the second reaction frame, the first support is fixed with a first clamping hydraulic cylinder, the second support is fixed with a second clamping hydraulic cylinder, the piston rod of the first clamping hydraulic cylinder is fixed with a first clamping block, and the piston rod of the second clamping hydraulic cylinder is fixed with a second clamping block. 5. An adaptive annular mechanical loading system as described in claim 4, characterized in that the side surfaces of the first clamping block and the second clamping block that are used to contact the ends of the rotating shaft are arc-shaped surfaces that match the rotating shaft. 6. An adaptive annular mechanical loading system as described in claim 1, characterized in that the piston rod of the loading hydraulic cylinder is connected to the distribution beam through a ball joint support to achieve a universal connection with the distribution beam. 7. An adaptive circumferential mechanical loading system as described in claim 1, characterized in that a magnetostrictive sensor is provided between the distribution beam and the cylinder end of the loading hydraulic cylinder to detect the extension distance of the piston rod of the loading hydraulic cylinder. 8. An adaptive annular mechanical loading system as described in claim 1, characterized in that the rotating shaft includes a first shaft section, a second shaft section and a sleeve arranged between the first shaft section and the second shaft section, the sleeve is sleeved on the periphery of the cylinder body of the loading hydraulic cylinder and is fixedly connected to the cylinder body of the loading hydraulic cylinder, the first shaft section is rotatably connected to the first reaction frame, and the second shaft section is rotatably connected to the second reaction frame. 9. An adaptive annular mechanical loading system as described in claim 1, characterized in that a first reaction frame is fixed with a first load-bearing beam, a first shaft section coaxially passes through the first load-bearing beam, and both ends of the first load-bearing beam are rotatably connected to the first shaft section through a bearing assembly; a second reaction frame is fixed with a second load-bearing beam, a second shaft section coaxially passes through the second load-bearing beam, and both ends of the second load-bearing beam are rotatably connected to the second shaft section through a bearing assembly. 10. An adaptive circumferential mechanical loading system as described in claim 9, characterized in that end caps are provided at both ends of the first load-bearing beam and are fixedly connected to the first reaction frame through the end caps, and end caps are provided at both ends of the second load-bearing beam and are fixedly connected to the second reaction frame through the end caps.